Synthesis and Characterization of Water-soluble CdHgTe Alloyed Quantum Dots

doi:10.3724/SP.J.1077.2011.00735

Abstract

Abstract: CdHgTe alloyed quantum dots (QDs) were directly synthesized in aqueous solution by heating a mixture of CdCl₂, HgCl₂and NaHTe in the presence of thioglycolic acid as stabilizer. The obtained QDs were characterized by fluorescent spectroscope, fourier transform infrared spectroscope (FTIR), X-ray powder diffraction (XRD) and transmission electron microscope (TEM), respectively. The results show that the technique lead to the formation of CdHgTe alloyed QDs with broad fluorescence full-width at half-maximum (70-90 nm), moderate photoluminescence quantum yield (1.5%-6.7%), and a broad emission spectra tunable from 536 nm to 688 nm. The water-soluble alloyed QDs with thioglycolic acid modification for CdHgTe are of zinc-blended crystal structure in a sphere-like shape.

Key words: quantum dots, luminescence, synthesis, characterization

CLC Number:

O657

WANG Yi-Lin, TONG Zhang-Fa, LU Jian-Ping, LI Jian-Hui, ZHOU Li-Ya. Synthesis and Characterization of Water-soluble CdHgTe Alloyed Quantum Dots[J]. Journal of Inorganic Materials, 2011, 26(7): 735-738.

References

[1] 刘晔, 向蓉, 黄菊, 等(LIU Ye, et al). 碲化镉量子点光催化降解溴化乙锭的研究. 化学学报(Acta Chim, Sinica), 2008, 66(2): 276-280.

[2] Krishnan S, Sanjeev G, Pattabi M, et al. Effect of electron irradiation on the properties of CdTe/CdS solar cells. Sor. Energ. Mat. Sol. C, 2009, 93(1): 2-5.

[3] Dong W, Li G, Wang M, et al. CdTe QDs-based prostate-specific antigen probe for human prostate cancer cell imaging. J. Lumin., 2009, 129(9): 926-930.

[4] Zhang Y, Li Y D. Synthesis and characterization of monodisperse doped zns nanospheres with enhanced thermal stability. J. Phys. Chem. B, 2004, 108(46): 17805-17811.

[5] Sapra S, Prakash A, Ghangrekar A, et al. Emission properties of manganese- doped ZnS nanocrystals. J. Phys. Chem. B, 2005, 109(5): 1663-1668.

[6] Raola O E, Strouse G F. Synthesis and characterization of Eu-doped cadmium selenide nanocrystals. Nano. Lett., 2002, 2(12): 1443-1447.

[7] Meulenberg R W, Hanif K M, Willey T M, et al. Structure and composition of Cu-doped CdSe nanocrystals using soft X-ray absorption spectroscopy . Nano. Lett., 2004, 4(11): 2277-2285.

[8] Mikulec F V, Kuno M, Bennati M, et al. Organometallic synthesis and spectroscopic characterization of manganese-doped CdSe nanocrystals. J. Am. Chem. Soc., 2000, 122(11): 2532-2540.

[9] Archer P I, Santangelo S A, Gamelin D R. Direct observation of sp-d exchange interactions in colloidal Mn2+- and Co2+-doped CdSe quantum dots . Nano. Lett., 2007, 7(4): 1037-1043.

[10] Liu S M, Liu F Q, Guo H Q, et al. Surface states induced photoluminescence from Mn2+ doped CdS nanoparticles. Solid State Commun., 2000, 115(11): 615-618.

[11] Tiseanu C, Mehra R K, Kho R, et al. Comparative study of time-resolved photoluminescence properties of terbium-doped thiosalicylic-capped CdS and ZnS nanocrystals. J. Phys. Chem. B, 2003, 107(44): 12153-12156.

[12] Zhou S M. Fabrication and optical properties of Sb-doped CdS nanowires. Mater. Lett. , 2007, 61(1): 119-122.

[13] Liu M, Man BY, Lin XC, et al. Effects of pressure on pulsed laser deposition of HgCdTe films. Mater. Chem. Phys., 2008, 108(3): 274-277.

[14] Malyk O. P. Charge carrier scattering on the short-range potential of the crystal lattice defects in ZnCdTe, ZnHgSe and ZnHgTe. Physica B: Condensed Matter, 2009, 404(24): 5022-5024.

[15] Franc J, Horodysky P, Grill R, et al. Characterization of optical and electrical properties of CdTe:Yb co-doped with Ge. J. Cryst. Growth, 2006, 286(2): 384-388.

[16] Shanmugan S, Balaji S, Mutharasu D. Synthesis and characterization of 10% Sb doped CdTe thin films by stacked elemental layer (SEL) method. Mater. Lett., 2009, 63(14): 1189-1191.

[17] Qian H F, Dong C Q, Peng J L, et al. High-quality and water- soluble near-infrared photoluminescent CdHgTe/CdS quantum dots prepared by adjusting size and composition. J. Phys. Chem. C, 2007, 111(45): 16852-16857.

[18] Tian J N, Liu R J, Zhao Y C, et al. Controllable synthesis and cell-imaging studies on CdTe quantum dots together capped by glutathione and thioglycolic acid. J. Colloid Interf. Sci., 2009, 336(2): 504-509.

[19] Yu W W, Qu L H, Guo W Z, et al. Experimental determination of the extinction coefficient of CdTe, CdSe, and CdS nanocrystals. Chem. Mater., 2003, 15(14): 2854-2860.

[20] Gaponik N L, Talapin D V, Weller H, et al. Thiol-capping of CdTe nanocrystals: an alternative to organometallic synthetic routes. J. Phys. Chem. B, 2002, 106(29): 7177-7185.

[21] Park C, Yoon T H. L-Cysteine-induced photoluminescence enhancement of CdSe/ZnSe quantum dots in aqueous solution. Colloid Surfaces B, 2010, 75(2): 472-477.